careers in politics watched the debate and they weighed in. >> deborah alfarone spent the evening with students from the school of public policy, and she has their reaction. >> reporter: inside university of maryland, public policy grad students are watching, reacting and tapping on their smart phones. >> it's not true. >> it's absolutely true. >> reporter: to be clear it was a lopsided crowd. do you mind if i ask for a show of hands of how many registered democrats? how many registered republicans? >> am i the only one? >> i'm one of the only republicans in the school. i don't know what the numbers are, what the percentage is but, you know, i don't mind. >> you want me to answer the question. i'm happy to the answer the question. >> and it is? >> reporter: as the debate heated up, so did the tapping, a new technology developed here from react labs that let's watchers react in real time. they have four choices, agree, disagree, spin or die.